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Borrowed Funds - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Nov. 04, 2002
USD ($)
shares
$ / shares
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Investment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]          
Prepaid wholesale borrowings   $ 10,400,000,000      
Accrued interest   12,400,000 $ 18,100,000 $ 12,400,000  
Short-term FHLB advances   $ 2,500,000,000 $ 300,000,000 $ 2,500,000,000  
Short-term FHLB advances weighted average interest rate   0.55% 0.81% 0.55%  
Short-term FHLB advances, average balance     $ 929,400,000 $ 2,300,000,000 $ 2,600,000,000
Short-term FHLB advances, average balance, weighted average interest rate     0.60% 0.42% 0.37%
Short-term FHLB advances, interest expense     $ 5,500,000 $ 9,800,000 $ 9,800,000
Interest expense     216,464,000 1,123,360,000 392,968,000
Short-term repurchase agreements   $ 1,500,000,000 1,500,000,000 1,500,000,000  
Interest expense     387,487,000 1,283,509,000 542,714,000
Federal funds purchased   426,000,000 $ 150,000,000 $ 426,000,000  
Federal fund purchased Weighted average interest rate     0.75% 0.48%  
Federal funds purchased, average balance     $ 525,400,000 $ 588,800,000 $ 430,100,000
Federal fund purchased Weighted average interest rate     0.51% 0.26% 0.25%
Federal fund purchased, interest expenses     $ 2,700,000 $ 1,500,000 $ 1,100,000
Junior subordinated debentures   358,605,000 358,879,000 358,605,000  
Capital security, call option (in years) 5 years        
Gross proceeds of BONUSES, debt     $ 1,181,000,000 11,243,500,000 50,000,000
Dividends on the Capital Securities, deferred period in Years     5 years    
Percentage of capital securities qualified as Tier II     100.00%    
Repurchase Agreements          
Debt Instrument [Line Items]          
Accrued interest   1,200,000 $ 1,200,000 1,200,000  
Interest expense     23,300,000 99,900,000 119,300,000
Short-term repurchase agreements   $ 0 0 $ 0 0
Short-term debt, weighted average interest rate   0.31%   0.31%  
Short-term debt, average outstanding amount       $ 197,300,000  
Interest expense       614,000  
Federal Home Loan Bank Advances          
Debt Instrument [Line Items]          
Interest expense     172,000,000 230,600,000 255,000,000
Junior Subordinated Debt          
Debt Instrument [Line Items]          
Interest expense     $ 18,500,000 $ 17,600,000 17,500,000
Number of business trusts owned | Investment     3    
Primarily Callable Wholesale Borrowings          
Debt Instrument [Line Items]          
Average cost of borrowings   3.16%   3.16%  
Wholesale Borrowings With Fixed Maturities          
Debt Instrument [Line Items]          
Average cost of borrowings   1.58%   1.58%  
New York Community Capital Trust V (BONUSESSM Units) | BONUSESSM units          
Debt Instrument [Line Items]          
Public offering of Bifurcated Option Note Unit Securities ("BONUSES units") | shares 5,500,000        
Public offering of units, offering price per share | $ / shares $ 50.00        
Gross proceeds of BONUSES, debt $ 275,000,000        
Difference between the assigned value and the stated liquidation amount of the capital securities is treated as an original issue discount 92,400,000        
Original issue discount amortized amount     $ 66,700,000    
New York Community Capital Trust V (BONUSESSM Units) | BONUSESSM units | Warrant          
Debt Instrument [Line Items]          
Gross proceeds of BONUSES $ 92,400,000        
New York Community Capital Trust V (BONUSESSM Units) | BONUSESSM units | Capital Units          
Debt Instrument [Line Items]          
Warrant to purchase, number of shares | shares 2.4953        
Warrant to purchase, total number of shares | shares 13,700,000        
Warrant to purchase, exercise price per share | $ / shares $ 20.04        
Capital security, term (in years) 49 years        
Capital security, coupon or distribution rate 6.00%        
Capital security, per share liquidation amount | $ / shares $ 50.00        
Gross proceeds of BONUSES $ 182,600,000        
FHLB - NY          
Debt Instrument [Line Items]          
Unused line of credit   $ 5,700,000,000 7,500,000,000 $ 5,700,000,000  
Borrowings under line of credit   $ 790,300,000 $ 10,000,000 $ 790,300,000  
Line of credit, weighted-average interest rate   0.52% 0.78% 0.52%  
Line of credit, average balance     $ 426,500,000 $ 572,700,000 $ 245,300,000
Line of credit, weighted average interest rate     0.59% 0.44% 0.37%
Interest expense     $ 2,500,000 $ 2,500,000 $ 895,000